Barmouth Road

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Barmouth Road in Wandsworth, London is a Victorian terraced house retrofitted to the EnerPHit standard. To meet strict planning requirements the building was insulated internally and triple glazed sash look-alike casement windows were installed to retain the original appearance of the facade.
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Barmouth Road : Project images

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CO2 emissionsPrimary energy requirement
Energy target

Energy and fuel use

Fuel use by type
Primary energy requirement
CO2 emissions

Measured data from renewable generation is not yet available.

Fuel use

Electricity use - - -
Natural gas use- - -
Oil use- - -
LPG use- - -
Wood use- - -
mains gas - 13800 kWh/yr -
Primary energy requirement - 114 kWh/m².yr -
Annual CO₂ emissions - 20 kg CO₂/m².yr -
Annual space heat demand - 23 kWh/m².yr -

Renewable energy

Electricity generationForecastMeasured
Renewables Technology--
Other Renewables Tech--
Electricity consumed by generation --
Primary energy requirement
offset by renewable generation
114 kWh/m².yr -
Annual CO₂ emissions
offset by renewable generation
20 kg CO₂/m².yr -

Calculation and targets

Whole house energy calculation method PHPP
Other whole house calculation method-
Energy target EnerPHit
Other energy targets-
Forecast heating load 14 W/m² demand


Pre-development air permeability test--
Final air permeability test-0.87m³/m².hr @ 50 Pascals

Project description

Start date01 March 2013
Occupation date01 April 2014
Location Wandsworth London  England
Build typeRefurbishment
Building sectorPrivate Residential
Property typeMid Terrace
Construction typeSolid Brick
Other construction typeSolid brick wall insulated internally.
Party wall construction
Floor area 139
Floor area calculation method Treated Floor Area (PHPP)
Building certification  Passivhaus certified building Passivhaus certified building

Project Team

OrganisationGreen Tomato Energy
Project lead personGreen Tomato Energy
Landlord or ClientLuigi Caccavale
ArchitectAlexander Owen Architecture
Mechanical & electrical consultant Green Tomato Energy
Energy consultantGreen Tomato Energy
Structural engineerElite Designers
Quantity surveyor
ConsultantCertifier - WARM: Low Energy Building Practice
ContractorReality HG

Design strategies

Planned occupancy3 persons
Space heating strategyHeating from mains gas condensing boiler. Distributed by under floor heating on lower floor and radiators on upper floor. Heat recovery from MVHR unit.
Water heating strategyHot water provided by mains gas condensing boiler.
Fuel strategyMains gas. Mains electricty.
Renewable energy strategy
Passive Solar strategyWindow proportions optimised using PHPP software.
Space cooling strategyNatural ventilation for cooling season. Daytime use of MVHR during heat waves.
Daylighting strategy
Ventilation strategyMechanical ventilation with heat recovery during winter months. Openable windows to encourage passive ventilation during the summer.
Airtightness strategy
Strategy for minimising thermal bridges
Modelling strategy
Insulation strategy
Other relevant retrofit strategies
Contextual information

Building services

Space heating
Hot water
Renewable energy generation system
Strategy for minimising thermal bridges

Building construction

Storeys 2
Volume -
Thermal fabric area -
Roof description Main house - 0.18 W/m2 K. New extension flat roof - 0.11 W/m2 K
Roof U-value 0.18 W/m² K
Walls description Solid wall with IWI - 0.17 W/m2 K. Insulated cavity wall - 0.13 W/m2 K
Walls U-value 0.17 W/m² K
Party walls description
Party walls U-value -
Floor description Main house suspended timber floor - 0.09. W/m2.KExtension solid concrete floor - 0.15 W/m2.K
Floor U-value 0.09 W/m² K
Glazed doors description
Glazed doors U-value - -
Opaque doors description
Opaque doors U-value - -
Windows description
Windows U-value 0.80 W/m² K -
Windows energy transmittance (G-value) -
Windows light transmittance -
Rooflights description
Rooflights light transmittance -
Rooflights U-value -